@addTagHelper *, TagHelpers

<html>
<head>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" rel="stylesheet"
        integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">
</head>
<body>
    <alert type="Danger">
        Greeting hooman:
        <hello />
        <world />
        <br />
        <img src="https://api.thecatapi.com/v1/images/search?format=src&mime_types=image/gif" />
    </alert>
</body>
</html>